Total length: 750 mm. Working length: 610 mm. Tool holder: SDS Max WERHE SDS Max plug-in quick change tools for pneumatic drill and chisel hammers have a shaft diameter of 18 mm and have 5 oval shaped grooves, 2 of which are closed and 3 open on one side. To derive from the working length of the total length of tools, subtract from the total length 130 mm. This is the length that is pushed into the machine.